arm/arm64: KVM: MMIO support for BE guest

[cascardo/linux.git] / arch / arm64 / include / asm / kvm_emulate.h

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index eec0738..b016577 100644 (file)
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -177,4 +177,52 @@ static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
        return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC_TYPE;
 }
 
+static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
+{
+       if (vcpu_mode_is_32bit(vcpu))
+               return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
+
+       return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
+}
+
+static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
+                                                   unsigned long data,
+                                                   unsigned int len)
+{
+       if (kvm_vcpu_is_be(vcpu)) {
+               switch (len) {
+               case 1:
+                       return data & 0xff;
+               case 2:
+                       return be16_to_cpu(data & 0xffff);
+               case 4:
+                       return be32_to_cpu(data & 0xffffffff);
+               default:
+                       return be64_to_cpu(data);
+               }
+       }
+
+       return data;            /* Leave LE untouched */
+}
+
+static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
+                                                   unsigned long data,
+                                                   unsigned int len)
+{
+       if (kvm_vcpu_is_be(vcpu)) {
+               switch (len) {
+               case 1:
+                       return data & 0xff;
+               case 2:
+                       return cpu_to_be16(data & 0xffff);
+               case 4:
+                       return cpu_to_be32(data & 0xffffffff);
+               default:
+                       return cpu_to_be64(data);
+               }
+       }
+
+       return data;            /* Leave LE untouched */
+}
+
 #endif /* __ARM64_KVM_EMULATE_H__ */